'stand alone' cold start idle Jaycar Kit? Coolant bypass type?

[mattysshop]

What can I use to make a primitive ‘cold start’ air bypass.. I know there are many valves that use a 6-8mm rubber hose that are normally open and then close when energized etc.. unsure how this would actually work, and I have heard of Jaycar PWM controllers that might also be useful? Im not sure how all of this witchcraft works and feel a little embarrassed actually asking.. I have the electrical experience of someone that can use a soldering iron, and can install a car stereo, complex wiring diagrams give me the sh!ts..

Another option is to use some sort of ‘in line’ coolant temp driven ‘wax pellet/bi metal strip’ type of arrangement, completely non PCB dependant and primitive..

The end goal is to allow enough air to avoid stall out when ‘cold’ and gradually close off relying on the normal throttle body based idle screw when warm.. doesn’t need to allow for idle up or pwer steering or a/c etc.. not for a road car..

Want to make it some what autonomous.. and avoid a ‘on off switch’.. the simpler and smaller/compact the better..

Thanks all,

[jondee86]

The most simple setup (and crudest) would probably be a reverse-acting thermo switch in the cooling water circuit. That would power ON a small 12V "idle-up" solenoid valve when the engine is cold, and OFF once it hits the thermo switch setting.

If you have a standalone ECU with a spare PWM output, you could do a simple PWM idle-up valve controlled according to the water temp sensed by the ECU.

Cheers... jondee86

[woggin]

Your best bet is using a wax pellet type of valve, i know the 4efte employs a wax pellet type idle air control valve when cold, works reasonably well.

It is the most simple for sure, electric idle control in a race car isnt really necessary, especially since you have no interest in 'idle up'

(lil off topic, do you actually believe in chemtrails? saw it on you yt page)

[mattysshop]

The most simple setup (and crudest) would probably be a reverse-acting thermo switch in the cooling water circuit. That would power ON a small 12V "idle-up" solenoid valve when the engine is cold, and OFF once it hits the thermo switch setting.

If you have a standalone ECU with a spare PWM output, you could do a simple PWM idle-up valve controlled according to the water temp sensed by the ECU.

Cheers... jondee86

like a very simple normally closed temperature switch? just running inline with a heater hose etc? i had thought of that, the only issue is that it would be an on/off switch.. i was hoping for something of a partially/gradually closing arrangement?

Woggin - problem is trying to find a small separate valve assembly. plenty of them out there from 80/90's jap cars, but there all attached to the TB itself.

[Omegaman]

just throwing it in here, but what your after is a idle speed stepper motor. i think from what i've read. It opens and closes gradually, as opposed to off and on.

[mattysshop]

just throwing it in here, but what your after is a idle speed stepper motor. i think from what i've read. It opens and closes gradually, as opposed to off and on.

i might have one in a 2JZ-GE inlet manifold in my shed.. how would one use it outside of factory application? i imagine that it is controlled by the ECU?

[mattysshop]

the one on the 2JZ-GE is a 6 pin.. i also have a 3 pin version with coolant lines..

from what i understand off the adaptronic website, center pin is 12v+ left and right are switching ground.
ign power to middle pin, and it opens 'about half'...
one side ground - closes
other side ground - fully open

not sure what the coolant does though? is there s bi metal strip etc associated with this also?

[jondee86]

What you need is one of these...
;

There are valves that need no control other than a 12V supply when the ignition is on. These heat up a bi-metalic strip that rotates a plate inside the valve and shuts the air down as the engine heats up, these are known as Extra Air Valves. They are becoming rare and hard to get hold of, they were fitted to various engines, like the Flapper type RV8 EFI's. The Idle Speed has to be controlled with the throttle stop when using these type of valves, as the valve is only used to add air when the engine is cold.
Here is a Bosch example:

Good luck with finding one

Cheers... jondee86

[Omegaman]

The stepper motor is controlled by stand alone ECU, you add the values ie temps you want the motor to gradually open and close.
The valve above is std on 18rgue's. Should be around as people who have gone stand alone on 18rgeu's have reverted to falcon or Hyundai air valves.

[mattysshop]

cheers for the input so far, all this info has been great

[madmont]

I have here a Aux Air Valve part number 22230-45010 if you want it. Do not know if it works

[jondee86]

Also, if you are using an Adaptronic ECU you can run pretty much any kind of 2-wire or 3-wire PWM ISCV. I have a 20V ISCV on my 16V with quads, and it works fine. Supplies all the idle air rather than just a bit of air for pushing the idle up, so kind of depends on the application as to how you use it. Easy enough to put a fixed orifice in the pipework somewhere to limit the air intake.



Cheers... jondee86

[kickn5k]

What you need is one of these...
;


Good luck with finding one

Cheers... jondee86

Pretty sure ive got one of these at home. Pulled it off my FJ20 turbo. I could be talked into letting it go real cheap.

Some ECU's wont run anything more than a 2 wire "BAC" valve.
When i changed from the E6K to the new sprint 500 the 4 wire stepper motor wasn't supported. I dont run one now, just bumped the cold idle timing a couple of degrees and it seems very happy.

[stidnam]

fairly sure I have one from a 2TGEU if kickn5k doesn't have what you need

[mattysshop]

i got that one off Madmont,

will try it and see how i go! cheers